Heading machine



Dec 3, 1929.

J. E. PRACNY 1,738,312

HEADING MACHINE Filed Jan. 24, 1928 2 Sheets-Sheet 1 ZZ'V Dec. 3, 1929.

J. E. PRACNY 1,738,312

HEADING MACHINE Filed Jan. 24, 1928 2 Sheets-Sheet 2 of stock into themand the discharge of the completed blank from them, and are closed tohold the stock tightly clamped while the desired length is cut off andwhile the punch or punches are operating, are termed the open dies.These dies are moved transversely in the die pocket in one direction bythe action of toggle links 4., the toggle links being straightened by alink actuated from The open dies are moved back and forth by this meansa distance equal to that between the cutting die opening and theextruding die opening 16, both of which openings are 'in the fixed plate17 of hardened steel set in the anvil plate 18. Back of the anviliplateis a filling block 19. The movable dies slide on hardened plates 20fastened in the bottom of the die pocket, and are held against the anvilplate by retaining guides 21 that are attached to the die cap 2:2 whichis, fastened down upon the top of the dies so as to-hold them on thebottom plates and against the anvil plate, as they are moved back andforth.

Any common type of stock feed may be eniployed, that illustrated havingrolls 2?) which are intermittently rotated by mechanism'Q-l to feed therequired length of stock into the machine, the stock being in the formof a continuous rod-or wire 25. lVith the open dies in feed position andslightly separated the feed rolls push the stock through alignedopenings in the frame, the filling block 19,

anvil plateQO, the fixed die plate 17 and the opendies until the end ofthe stock is stopped by the gauge arm 26. This stop arm is oscillated,by theusual mechanism, into the path of the stock as it is fed, and backout of the way after the feed is completed. The open dies are thenforced transversely in the die pocket by the toggles, which first closethe dies so that they will tightly clamp the stock, and thenemove thedies so that a length of'the. clamped stock is cut off between the vbackface of the open dies and the front face of the fixed cutting die 15,and carried into 7 line with the extruding die 16 and the punch 27, inwhich position the dies. and filling blocks arevery tightly clampedtogether between the thrust plate 9-8 and the plunger plate 9. With thedies held in this manner the'puneh comes forward and strikes th stockdriving'it back so asto force the inner end of the stock into theextruding die 16,

the opening in which is somewhat smaller than the opening in the opendies, and thereby reducing the diameter of and extending the length of asection 29 of the inner end of the stoc r and at the same time upsettingand forming a head 30 on the outer end of the stock, Fig. 3. If it is adouble blow machine as shown in the patent referred to, the first punchmay merely initially shape the outer end of the stock and the secondpunch complete the head on the outer end of the stock.

In line with the extruding die is a pin 31 which is designed to limitthe length of the stock that is extruded and subsequently drive theextruded section from the solid, extruding die. Back of this pin is arod 32, the position and action of which is controlled by the lever 83that is engaged by a stud ill on a slide 3:) which is reciprocated by alink actuated by a cam in the manner common in the class of closed dieheaders. lVhen the blank is headed by the punch and reduced and lengthened by being driven into the extruding die, the backing pin is inposition to be engaged by the inner end of the stock, as shown in Fig.3. After this operation is completed the pin is driven forward so as toforce the ex truded end of the blank from the extruding die into theopen dies which then carry the blank into line with the incomin lengthof stock to be fed, as illustrated in 1* ig. 5. The subsequent feed ofstock ejects the finished blank from the open dies and the cycle ofoperations is repeated.

By means of the combination of open dies, which clamp, sever and carrythe stock into line with the punch, and solid extruding die,illustrated, a common header may be used to produce long blanks withheads at one end and with sections reduced for thread rolling at theother end without increasing the size of the machine or reducing itsspeed o l operation. lVith open dies the stock being clamped tightly theend is cut off more squarely than it is when out off at the face of asolid die so that the blanks are in better condition for having theirinner ends reduced and extruded without excessive wear on the extrudingdie, and to have their outer ends properly headed by the punch, but ithas been found impractical to extrude with open dies only for such diestend to spread under the impact of the blows of the punch and leave finson the extruded section. lVith a solid die only the stock has to be fedcompletely through it and cut off beyond its face, and the cut piecestransferred by carrying mechanism into line with the punch and thendriven back lhe entire length of the solid die when headed and extruded,and subsequently pushed forward the whole length of the die in order tobe ejected. which requires a greater distance between the face of thedie and the punch carrying gate, thus necessitating an increase in thesize of the machine, a greater travel for the punch and a longermovement for the ejccting or knock-out pin with a consequent loss oftime, than when open dies are used.

The invention claimed is:

1. A heading machine having a die pocket solid. cutting die and a solidextruding die fixed in said pocket, and dies adapted to be opened andclosed and moved transversely in the pocket, means for feeding stool;through the cutting die and movable dies, mechanism for moving saidmovable dies across the face of the cutting die and severing a length ofthe stock and carrying it into line with the extruding die, areciprocating punch in line with the extruding die and adapted to strikethe stock held by the movable dies and. drive its inner end into theextruding die, mechanism for ejecting the stock from the extruding die,and means for returning the movable dies into line with the cutting dieand allowing the incoming stock to eject the completed blank from themovable dies.

2. it heading machine having a die pocket, a plate containing a cuttingdie and an extruding die fixed in said pocket, dies adapted to be openedand closed and moved transversely in the pocket, means for feeding stockthrough the cutting die and movable dies, mechanism for moving saidmovable dies across the face of the cutting die and severing a .1 en gthof the stock and carrying it into line with the extruding die, areciprocating punch in line with the extruding die and adapted to strikethe stock held by the movable dies and drive its inner end into theextruding die, mechanism for ejecting the stock from the extruding die,and means for returning the movable dies into line with the cutting dieand allowing the incoming stoclr to eject the completed blank from themovable dies.

3. A heading machine having a die pocket, a solid cut-ting die and asolid extruding die fixed in said pocket, and dies adapted to be openedand closed and moved transversely in the pocket, intermittently rotatedrolls for feeding stock through the cutting die and mova le tries,mechanism for moving said movable dies across the face of the cuttingdie and severing a length of the stock and carrying it into line withthe extruding die, a reciprocating punch in line with the extrud die andadapted to strike the stock held by the movable dies and drive its innerend into the extruding die, mechanism for ejecting the stock from theextruding die, and means for returning the movable dies into line withthe cutting die and allowing the incoming stock to eject the completedblank from the movable dies.

4:. A heading machine having a die pocket, a solid cutting die and asolid extruding die fired in said poclret, and dies adapted to be openedand closed and moved transversely in the pocket, means for feeding stockthrough the cutting die and movable dies, mechanism for moving saidmovable dies across the face of the cutting die and severing a length ofthe stock and carrying it into line with the ex. truding die, areciprocating heading punch in line with the extruding die and adaptedto strike the stock held by the movable dies and simultaneously head itsouter end and drive its inner end into the extruding die, mechanism forejecting the stock from the extruding die, and means for returning themovable dies into line with the cutting die and allowing the incomingstock to eject the headed and extruded stock from the movable dies.

5 A heading machine having a die pocket, a solid cutting die and a solidextruding die fixed in said pocket, and dies adapted to be opened andclosed and moved transversely in the pocket, means for feeding stockthrough the cutting die and movable dies, mechanism for moving saidmovable dies across the face of the cutting die and severing a length ofthe fed stock and carrying it into line with the extruding die, a recirocating punch in line with the extruding die and adapted to strike thestock carried by the movable dies and drive its inner end into theextruding die, a knock-out pin and mechanism for causing the knockoutpin to push the end of the stock from the extruding die, and means forreturning the movable dies into line with the cutting die and allowingthe incoming stock to eject the completed blank from the movable dies.

6. A heading machine having a die pocket, a cutting die and an extrudingdie fixed in said pocket, and dies adapted to be moved transversely inthe pocket from the cutting die to the extruding die, means for feedingstock through the cutting die and movable dies, mechanism for movingsaid movable dies across the face of the cutting die and severing alength of the stock and carrying it into line with the extruding die, areciprocating punch in line with the extruding die and adapted to drivethe inner end of the stock into the extruding die, mechanism forejecting the stock from the extruding die, and means for returning themovable dies into line with the cutting die.

7. A heading machine having a die pocket, a solid extruding die fixed insaid pocket, and dies adapted to be opened and closed and movedtransversely in the pocket means for feeding stock through the movabledies,mechanism'for causing said movable dies to carry a length of stockinto line with the extruding die, a reciprocating punch in line with theextruding die and adapted to drive the inner end of the stock into theextruding die, and mechanism for ejecting the stock from the extrudingdie and from the movable dies.

JOHN E. PRACNYi

